Air cleaner



Aug. 26, 1930. A. A. BULL L77452 AIR CLEANER Filed Sept, 14, 1925 2Sheets-Sheet 1 OOOOOOOOOOO f f A v SNES n i,

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Filed sept. 14, 1923 2 sheets-Snam 2 Patented Aug, :26,Y 19,30v

UNITED v.sfl'A'-r-r-.s PATENT y.orvrflcrz .ARTHUR A. BULL, F DETROIT,MICHIGAN l Application led September This invention relates toautomobiles and has for its 'object an arrangement of a car buretor andan air filter whereby the position of the air ilter eliminatesja largeamount of dust that would otherwise be drawn into the lter. Furthermore,the air taken into the carburetor especially in'a closed car, has a moreuniform temperature both in winter and in summer than is the case withair drawn from under the hood. l

The filter is so designed that the cross section of the intake of thecarburetor has a relation to the area of the ltering material of atleast 1 to 100. Consequently the air is drawn through the ilteringmaterial very slowly and by-'very weak suction. The dust on the iilterinmaterial therefore does not adhere to thetering material very tenaci--ously and vibration" of thecar very easily shakes it' off and drops itdown into the bot-h tom of the filter where it escapes. v

Another feature of the filter is the arrangement of the filtering unitwith thevv louver' `plate and the arrangement of these two elements withre ect to the dash, so that theA ltering unit may e removed through thedash of the-car-for cleaning. This makes it very easy for the driver atany time to clean the filter. l In the drawings: v

' Fig. 1 isa fragmentary longitudinal section of the front 'of anautomobile, showing -the iilter in place and connected up with thecarburetor.

Fig. 2 is a front view part in section. y

Fig. 3 is a vertical cross section taken on the line 3-3 of Fig. 2. f

Fig. 4 is a horizontal section of theiilter. Fig. 5 is a section showinghowthe filtering unit may be removed from the housing.

Air lters are quite commonly used in connection with tractors which stirup' a large amount of dust and it is a recognized necessity withtractors to in some way prevent ofthe filter with -a 14, 1923. SerialNo. 662,782.

this dust passing into the cylinders. It is a well known fact that dustand grit passing into the cylinders causes the cylinder walls and theplston to wear and causes the com- 7pression efliciency of the engine todeteriorate. 50

Itis also anlascertained fact that a large amount of the .depositsupposed to be carbon deposit on the heads of the cylinders and plstonsis nothing more or less thanlarge accumulations of dust and grit mixedwith the carbon. These facts have been -appreciated to a certain extentwith tractorsy'whe're the dust to air ratio is larger and Whereobviously some measure of protection must be adopted. However, verylittleeifort has been 6u made to develop suitable ilters for automobilesand trucks.

.' Dust separation is eifectedzoften by a fan or centrifugal devicewhich tends to throw out the dust vfrom the. air andfseparatel it fromthe air before the same is drawn into the carburetor. The filters usedwith tractors have been largely of the oil or Water type and are usuallyheavy, cumbersome things that. are ill-adapted for use on passengercars.

It is to avoid these heavy cumbersome filters andl yet provide .anefficacious air straining device that I have designed the apparatushereinafter described.

Referring tothe drawings: 75 f a designates the carburetor, Z themanifold,- `0 the engine block and da pipe leading from the filterhousing fto the carburetor.

This filter comprises a housing f which 4may be a suitably designedstamping', or of '30 course, it could be a casting; Bolted to the faceof this housing'is a louver plate g, which in a' small measure tendstostrain the air by preventing thev dust settling into' the filter, it

having to be drawn' up through; the bottom sa openings of. the' louvers.Within' the housingand back of the louver plate are a'. large numi berof corrugations formed by bending the wire mesh or screen y' in a sortof bellows-like arrangement. On the inside of these corrugaf W n e niter directly the air @onset uently, the d ure conc filtering naterialrsuch Y l niost autoinob ..e either go 'through it or ledge on it so o .Jl vision is made -"o locating lcannot be easily shaken loosec l thecarburetor in he winter These corrugations supp g heat in tne snininer.m Ae, which has openings m L is is or u called the steve.. lo isreetorn, through which the suspence; ognized i e best 'temperature torair to is shaken o the iilter, drops into l e taken into the carburetoris air at substanbelow and slides down the inclined lally summer heat.Consequently, 2e 'to the opening o oi the center, 'f no inter time theis drawn o the eahaust it 1s discharged. This arrangement or nevpipe;inthe summer time this is discontinued ing small holes in the plate isand a relatively as it is found that/the air is too het to long andnarrowqslot in bottoniL the best results in the carburetor. v Gosen1-approximately of an inch, n-

wenn esoeeia y e 'i .1 desiraole te pnl quent-ly, seine hind of valve isordinarily pron any large amount oi air being drawn up into vided todiscontinue the use of the stove in the filter from under the hood. Thegreat the summer. In a rough way, l aonroacli bulk of air must loe takenfrom the inside oiri these same advantages by placing -the' air thecompartment where it is free izrorn the inta-ke in the driverscompartment. Air in ldust ordinarily occurring in the air under' the aclosed carin the drivers compartment even hood. in the coldest wintertime, is not a great deal It will be noted that the plate is rivetedbelow normal room temperature. 'in an open to the louver plate as arealso the ends oi the car, of course, it is considerably colder but atvcorrugated wire mesh. Hence, these corruthe same time the air under thecowl in front gations of filtering material are a unit with of the dashis much warmer than it is under the louver plate and can be removed withthe the hood where the cold blast is drawn in by ion louver plate fromthe housing. Bolts fw are the fan. Hence, placing the air intake opensetin from the inside oi3 the dash. The housing of the filter in thed'rivers compartment ing is bolted to the insidek oi the dash by tendsto take air of a temperature very much the square nuts y and acorn nutsas on the better calculated for the use of the carburetor ends ofthebolts removably secure the louver both in the cold winter weather and inthe m5 plate to the inside of the dash. Hence, by summer weather. simplyremoving the acorn nuts w, the driver If the air in the driverscompartment 1s may easily remove the filtering unit and shake not foundsufficiently warm to constitute a or clean any dust oi that has not beenshaken fair substitute for the stove on the exhaust,

olf by the vibration of the car. This makes it suiiicient heat may besecured by passing the 110 very easy and convenient to clean the device.pipe from the filter to the carburetor in prox- So far as I am aware,the few filters that imity with the exhaust pipe, as for instance,

have been used in connection with passenger .ceiling 1t around the sameor some other sim- 'cars or trucks have taken the air from under y 11111arrangement .50 the hood. There is a very heavy circulation 'What IClaim is: 115

draft of the fan which draws the air through of dust laden air under thehood due to the air 1- In an automotive Vehicle, the Combina' beingsucked through the radiator for cool- 'l10n of a body Prollded Wlth adash 8 hood Th' 11 h land an internal combustion engine provided mg 1S1S usua y accentuated due to t e with a-carburetor located under thehood, a

the `mdmtor mterstlces and throws l-t back and having connection withthe carburetor,

on the engine' In traveling along a dusty and a ilterin unit removablsecured in the road a lar amount of (hist 1S Pmked up thls housing andmovable in its eyntirety through way especially 'where vehicles travelon the the rear of the dash ao road near by.. This willbe evident toany- Q In an automotive Vehicle the Combinabody that has mspected hisent-lm? after gomg tion of a body provided with a dash and with OYP adusty CQunty ljoad- T1115 dust laden a carburetor located under thehood, a filter air/1s drawn directly mto the mouth 0f the housingsecured to the front of the dash and filter and some of it either drawnthrough having connection with the carburetor, and 045A the lter or elseso nach of it is drawn into a louver plate provided with a ltering unitlter housing secured to the front of the dash 12oreniovalsle through theEem of the lash fiom the :5111er housing 3. ln en automotive vehiclesthe combinetion of e body provied with e (laslas u lioorl and aninternal combustion engine proyide with a carlouetor located 'under thehoo, e filter housing bolted to the liront of the ash and having a. pipeconnection with the eurburetor, a louver plate pioviclecl with alil'terring unit on its back comprising 2L plurality of Vertical foldsof filtering material and removably secured to the filter housing butremovable therefrom ythrough the rear of the dash.

v ln testimonywhereof l ax my signature.

' l A, BULL,

